Make Allure result files durable before publishing

[vdvukhzhilov]

• Stage Allure filesystem artifacts (test/container/globals JSON and attachments) as .allure-write-*.tmp in the results directory, sync with fflush / fsync (when available), then rename to the final name so live readers do not see partially written finals.
• On overwrite platforms where rename-over-existing fails (typical Windows), move the old final aside, publish the staged file, then remove the aside backup; if publish fails after the aside step, restore the old final when possible and keep the staged temp with the new payload.
• Incomplete temps (failure before sync) are deleted; fully synced temps are kept if publish fails so the new payload is not lost.